2020 GM Articulating Assist Steps

[Johnny-5]

Just finish building the harness and finding all the wire locations to make the factory articulating running boards work on an LT silverado.  Lots of research and time went into this mod.  They work perfectly and have all the messages in the cluster when operated from the switch inside.

 

 

[Booma1218]

On 10/14/2020 at 10:18 AM, Johnny-5 said:

Just finish building the harness and finding all the wire locations to make the factory articulating running boards work on an LT silverado.  Lots of research and time went into this mod.  They work perfectly and have all the messages in the cluster when operated from the switch inside.

 

 

Awesome!!!!!!What's the cost in total look like to do the mod?

[O Town Denali]

Nice mod.  I use mine to reach into the front of the bed often.

[Daly]

On 10/14/2020 at 10:18 AM, Johnny-5 said:

Just finish building the harness and finding all the wire locations to make the factory articulating running boards work on an LT silverado.  Lots of research and time went into this mod.  They work perfectly and have all the messages in the cluster when operated from the switch inside.

 

 

A write up on how to do this and what parts are needed would be nice. 

[Johnny-5]

50 minutes ago, O Town Denali said:

Nice mod.  I use mine to reach into the front of the bed often.

Thanks,  I look forward to that whenever  the tonneau cover is off and I am tying down stuff.

[Johnny-5]

19 minutes ago, Daly said:

A write up on how to do this and what parts are needed would be nice. 

I reached out to the Harness Dr. and sunce he didn't have a harness available I was able to buy the wire, terminals, and connector  bodies for the connections of the step motors and modules.  They use molex 120 series connectors and Yazaki 150 series (i think).

The UBEC had the electric step fuse in it, but the chassis harness didn't have the wiring in it so I added a single 2mm power wire to the black chassis connector that plugs into the bottom of the fuse block.  I had to buy the conn socket terminal (found on digi-key website).  That went into position G6 of the connector.

 

I had to add a wire to connector x138 located a ove the driver inner fender, but below the airbox.  It was a 20 way connector that attaches the chassis harness to the body.  This wire was for the BRS cancel/disable circuit.  My truck was prewired on the body side for the in dash swtich and that wire terminated at x138.  I added the molex 120 series male terminal to the chassis side of the harness.

 

I bought the multi-switch that contained the board switch and outlet switch alomg with one blank.  The multi-switch conne tor was pre-wired and required no mods.

 

The last wire to integrate to the trucks system was the GM low speed LAN data bus wire.  This was tricky because not all trucks have the same options, so you may need to tap in somewhere else on hour particular truck.  I was able to find that the floor harness had the wire located at the driver seat connector.  I had to add a wire to pin 5 location to mate with the floor harness connector.  my truck doesn't have a memeory seat module, so the seat harness has a vacant socket on the sear side and the GM Low LAN on the other.  That connector is an ergo-mate 55 way by Aptive / delphi.  

 

Besides that it was a matter of connecting all the board wires to their control module using the factory diagram, and connector end views.

 

I will post more pictures,  and some part numbers for everyone.  Keep in mind that I went the extra mile to integrate it all like factory, but instead of doing terminals like me, you can just clip the wires out of their connecors and connect them to your homemade board harness with butt connectors, for the GM Low LAN and cancel switch.  You can also add the power wire directly to the power post on the fuse block and add an inline fuse.  (lots of options)  I am very ****** rententive with wiring and as a former GM Shop Foreman I have the knowledge of how to disassemble all the connectors and where to put everything.  I tried to rout everything cleanly under the truck as well.

[Johnny-5]

[Johnny-5]

40 minutes ago, Daly said:

A write up on how to do this and what parts are needed would be nice. 

 

2 minutes ago, Johnny-5 said:

I tried to add more pictures,  but I am limited to 4.8 MB

[Johnny-5]

5 hours ago, Booma1218 said:

Awesome!!!!!!What's the cost in total look like to do the mod?

It cost 800 for the boards on Offerup, 100 for connectors and wires, 40 in terminals, 50 in splitloom.

[BrianW00]

Johnny-5

Do you have a list of the plugs and wires you used for the power steps? I just got a set and I’m trying to figure out how to install/ wire them. I’m finding bits and pieces but if you had something showing what you connected to and the plugs you used that would be amazing. Also you mentioned your truck having one of the plugs? Where was that plug located on the truck? I’ve been looking mine over and I’m probably not looking in the right places.